Détermination par microscopie électronique de la granulométrie d’une émulsion d’eau et corrélation entre la cristallisation des gouttes et leurs diamètres

Broto, F.; Clausse, Danièle; Babin, L.; Mercier, Michel

doi:10.1051/jcp/1978750908

Cited by 11 publications

(5 citation statements)

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“…A wealth of literature and the wide diversity of techniques in use (for example Mittal, 1977;Shah & Schechter, 1977;Winsor, 1954) clearly show the interest and the difficulties encountered in studying microemulsions. It was shown by us, as well as by other authors (Biais et al, 1977a;Broto et al, 1978;Sjoblom & Friberg, 1978;Boutillier, 1978) that direct information about the structure of these systems and their modifications could be obtained by an electron microscopic study. Such data were expected to bring about a fundamental basis for the interpretation of the results given by other techniques and for the discovery of stability criteria for those systems.…”

Section: Introductionmentioning

confidence: 72%

Microemulsions and electron microscopy

Biais

Mercier

Bothorel

et al. 1981

Journal of Microscopy

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SUMMARY The replicas obtained from various microemulsions prepared under different freezing conditions were observed by electron microscopy. The difficulties encountered in obtaining proper freezing may be related to the peculiar properties of such systems. A proposal is made for using systems with particular physical characteristics, which preserve the micellar structure during freezing, instead of looking for perfect freezing conditions. This proposal proved to be successful.

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Section: Introductionmentioning

confidence: 72%

Microemulsions and electron microscopy

Biais

Mercier

Bothorel

et al. 1981

Journal of Microscopy

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“…Emulsiffication was carried out by mixing at room temperature the water phase and the oil phase in a convenient steel vessel for 60 s by means of a high-speed homogenizer (54 000 rpm). Electron microscopy [2] of replicas of emulsions characterized by P = 0.25 has shown spherical granules whose diameters are less then 1/an; the mean diameter being around 0.5/*m.…”

Section: Methodsmentioning

confidence: 99%

Influence of a precooling on the nucleation kinetics of ice from water droplets

Clausse

Broto

1982

Colloid & Polymer Sci

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“…Another temperature has been introduced more for commodity reasons than for theoretical ones linked to the experimental procedure used to study a great number of droplets as it is the case in an emulsion. This temperature has been referred in the literature as the most probable freezing temperature T* [60,61,[74][75][76].…”

Section: Solidification Of a Single Samplementioning

confidence: 99%

“…The model described before can be improved by introducing in the equations the polydispersity of the droplets described by an analytical function. An example of such a determination can be found [60,74] by using the following analytical function:…”

Section: Solidification Of a Single Samplementioning

confidence: 99%

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Freezing Within Emulsions: Theoretical Aspects and Engineering Applications

Clausse

Dalmazzone

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-Conge´lation dans les e´mulsions : aspects the´oriques et applications techniques -Cet article se concentre principalement sur le comportement a`la conge´lation des e´mulsions qui sont conside´re´es soit comme des syste`mes permettant d'obtenir des informations sur les mate´riaux en surfusion, soit comme des syste`mes disperse´s complexes implique´s dans les proce´de´s industriels. En raison du fait qu'il existe une phase disperse´e sous forme de fines gouttelettes dans les e´mulsions, des retards a`la solidification sont observe´s et les gouttelettes de liquide persistent meˆme en dessous du point de fusion du mate´riau. La corre´lation entre la tempe´rature de solidification des gouttelettes et leur taille peut eˆtre donc utilise´e pour suivre l'e´volution de la morphologie de l'e´mulsion en fonction du temps aussi bien sur terre que dans des conditions de microgravite´(projet FASES soutenu par l'ESA). Une description de ces phe´nome`nes observe´s principalement par microcalorime´trie sera donne´e pour des corps purs disperse´s ainsi que pour des solutions disperse´es. Dans certains cas, les e´mulsions peuvent eˆtre recherche´es pour leurs proprie´te´s spe´cifiques, telles que la grande taille de l'interface huile/eau, conduisant a`des transferts de masse ame´liore´s; les e´mulsions peuvent eˆtre par conse´quent utilise´es comme des membranes liquides pour l'extraction, le stockage et la libe´ration controˆle´e de matie`res actives. Dans d'autres cas, la formation d'e´mulsions a un effet ne´faste sur les proce´de´s, comme dans l'industrie pe´trolie`re ou`des e´mulsions eau-dans-pe´trole tre`s stables se forment facilement et compliquent l'ope´ration de de´shydratation du pe´trole brut.Abstract -Freezing Within Emulsions: Theoretical Aspects and Engineering Applications -This article is mainly focused on the freezing behaviour of emulsions which will be considered either as systems permitting to get information about undercooled materials or as complex dispersed systems involved in industrial processes. Due to the fact that there exists a phase dispersed as tiny droplets in emulsions, solidification delays are observed and liquid droplets are still observed under the melting points of pure materials. The correlation between the solidification temperature of the droplets and their size may be therefore used to follow the evolution of the emulsion morphology versus time on ground as in microgravity conditions (FASES project supported by ESA). A description of these phenomena mainly observed through microcalorimetry experiments will be given for dispersed pure materials as for dispersed solutions. In some cases, emulsions may be sought after for their specific properties, such as their large oil/ water interface, leading to enhanced mass transfers; emulsions may be consequently used as liquid membranes for extraction, storage and controlled release of active materials. In other cases, the formation of emulsions has a detrimental effect on the process. It is the case in the oil industry where very stable w...

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Détermination par microscopie électronique de la granulométrie d’une émulsion d’eau et corrélation entre la cristallisation des gouttes et leurs diamètres

Cited by 11 publications

References 0 publications

Microemulsions and electron microscopy

Microemulsions and electron microscopy

Influence of a precooling on the nucleation kinetics of ice from water droplets

Freezing Within Emulsions: Theoretical Aspects and Engineering Applications

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